* WHAT...The South Coast AQMD has issued an air quality alert due to increased fine particle pollution from wildfire smoke. Visit https://www.aqmd.gov/alertinfo to check current and forecasted air quality levels. * WHERE...at high elevation areas in the San Gabriel and San Bernardino mountains including Big Bear Lake and Lake Arrowhead. Levels of particle pollution can vary by time and location depending on fire activity and local weather conditions. * WHEN...through 5 PM Saturday. The highest impacts are expected Friday night and Saturday morning. * IMPACTS...Particles in wildfire smoke can get deep into the lungs and cause serious health problems such as heart attacks, strokes, asthma attacks, and difficulty breathing. Everyone can be affected, but people with lung or heart disease, older adults, people who are pregnant, children, and those who spend a lot of time outdoors are at greater risk.